public class Examble3_6{
   public static void main(String args[]) {
   double sum = 0,item = 1;
   int i= 1,n = 20;
   while(i<=n) {
   sum = sum+item;
   i = i+1;
   item = item*(1.0/i);
    }
    system.out.println("sum="+sum);
      }
   }
